[Bug rtl-optimization/59754] [ree.c] Incorrect merge while working with vector registers

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59754

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 31795
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31795&action=edit
gcc49-pr59754.patch

Untested fix.  Tried to think if the other (older) REE transformations aren't
wrong for vector modes, but haven't found anything yet.